While that is an option, I am fairly sure something will be announced for WoW as well. As of right now, we have no idea what happens after 7.3, and given the speed they've been updating us on things...

So far the Shadowguard appear to be the (Void) Ethereals. Their models are labeled as such afaik. Though, their colours are different from this void elf stuff. But it wouldn't surprise me if they use...